Reciprocating gear mechanism



May 4, 1937. I c, w HUFFMAN 2,079,171

RECIPROCATING- GEAR MECHANI SM Original Filed June 9, 1934 2 Sheets-Sheet l- INVENTOR CONARD WARREN HUFFMAN.

, @ATTORNEY y 1937. c. w. HUFFMAN 2,079,171

v RECIPROCATING GEAR MECHANISM Original Filed June 9, 1954 2 Sheets-Sheet 2 5.? H LL Mm Q i IN 5 N TOR CONA RD WARREN HUFFMAN.

A TTORNEV I Patented May 4, 1937 UNITED fsTATss PATENT @EFECE 2,079,171 nEcIPnooA'rING GEAR MECHANISM Oonard Warren Huffman, Lynwood, Calif., as-

signor of twenty-five per cent to Van Lyman Denton, San. Gabriel, Calif.

Application June 9, 1934, Serial No. 729,845

Renewed September 25, 1936 9 cl ims. (on. 74-30) reciprocating gear mechanism which is simple to construct and to assemble, and which is effectivein operation. g r V M Another objectis'to provide a deviceof the- 10 character stated; in which the excessive jerk is eliminated, duetoithemovementof the recip-ro cating elongatedv gear-from one side thereof to the other.

Another object is to provide a novel' means of T eliminating excessive strain on the elongated gear and pinion due'to the tendency of the elongated gear to tilt relative to the pinion.

Novel features of myinvention reside'in the methods of [assembling the elongated gear, the

housing fandbox cam, and the like.

Other objects, advantages, and features of invention may appear from the accompanying gear mechanism. Y r V Figure 4 is a rear elevation of the same.

Figure 5 is a plan. view of one of the cross head rollers. v

Figure 6 is an endzview of one of the cross over gears. I

Figure '7 is asectional viewtakenon line 'I'I ofFig.6.

Fig. 8 is an enlarged fragmentary front elevation of the gear mechanism.

"Figure dis a diagrammatic partially section viewtof thegeartrain and a fragment of the housing. j Figure 10 is an end view of the ly wheel, 7 Referring more particularly tothe drawings, the numeral llindicates a drive shaft which is rotated from any suitable sourcefof power (not shown) A gear train 2 transmits therotary.

I movement of the shaft I to the jack shaft 3. A gear train 4 then transmits. the movement of the jack shaft 3 tothe pinion shaft 5. A-fly wheel 6 ismounted on the drive shaft I so as to steady thevrotation of this shaft and to prevent the, '55 driving motor from raising, due to the varying stresses which are applied to the gear mechanism.

A pinion gear I is secured to the shaft 5, and meshes with an externally cut elongated gear 8. The elongated gear is preferably formed by a plurality of rack sections 9 and twoysemi-circular transfergears I0 and I I. The racks andtransfer' gears are fitted together, as shown'in Figs. 1, 3 and 8,so as to provide a continuous elongated external gear. The elongated gear 8 is detachably secured to a gear frame I2. The gear frame I2 is preferably made in three or more parts, in;

reciprocating eluding a central plate I3 which includes one or more sections; and arcuate ends I I, I5. The ends I 4, I5 are bolted onto the top and bottom respectively, of the central plate I3 by means of a plurality of studs or bolts I6, I1, respectively. The rack sections 9 are bolted, or otherwise suitably detachably secured to the plate I3 by means of a plurality of bolts I8. The transfer gearslfl and II are preferably formed as'follows: a continuous gear is first cut and is then sawed in half along the center line and these halves are then fitted at the top and bottom, respectively, of the rack sections 9'. The transfer gears are so cut that'the teeth will properly mesh with the rack sections, and the pinion I will then follow continuously around the elongated gear. The transfer gears are each formed with an elongated hub I9 which is semi-circular in cross section. This hub fits into a semi-circular bore in the ends I4 or I5. The flat part of the hub rests against the end of the center plate I3. A dowel pin 20 extends thru the hub I9 and into the end of the plate I3, thus holding the transfer gear in proper position. The flat part of the hub l9 will hold the gear against tilting. A recess or box cam 2| is formed in the plate I3 and the ends I4, I5, thus forming a continuous track which accurately conforms to the shape of the elongated gear 8.

A trunnion 22 projects from the pinion gear I into the box cam M. This trunnion serves to holdthe pinion in proper spaced relation relative to the elongated gear 8. That is, the pinion is so held that the teeth thereof will properly mesh with the teeth in the elongated gear. A sleeve may be mounted on the trunnion, 22 to reduce friction in the boxcam.

An eye 23 is integrally formed on the end I4 so that a cable or the like, can be attached there to, this cable extending toa counterweight (not shown). j A rod 24 depends from the end I5 and is pivotallysecured to a cross head 25. A plurality of rollers 26 are mounted on the cross head 25 and each roller is grooved, as shown at 21, and fits on vertical guides 28, 29. This cross head, cooperating with the guides 28, 29, will hold the reciprocating gear mechanism from twisting around a vertical axis. Thus, the box cam, pinion, and elongated gear are relieved of a great deal of strain, and the life of the gears is materially increased.

A rod 30 depends from the cross head 25 and extends to a device to be operated, such as a' In order to hold the gear 1 against outward movement, I provide a flange 3| on the gear, which fits into a groove 32 in the elongated gear. Inward movement of the pinion is, of course, prevented by the flange engaging the face of the gear frame.

In operation, the stresses on the reciprocating gear mechanism will Vary but the speed of the shaft l is held substantially constant because of the fly wheel 6. This fiy wheel 6 prevents back lash in all of the gears and tends to make a mechanism which will operate more quietly.

Having described my invention, I claim:

1. A reciprocating gear mechanism comprising a pinion, drive means for said pinion, an externally cut elongated gear, said pinion meshing with said gear, a gear frame, means detachably securing the elongated gear to the gear frame, said gear frame having an elongated box trackway formed therein, a trunnion projecting from the pinion into the trackway whereby the pinion is held in constant mesh with the elongated gear, and guide means whereby the gear frame is held against twisting movement.

2. A reciprocating gear mechanism comprising a pinion, drive means for said pinion, an externally cut elongated gear, said pinion meshing with said gear, a gear frame in which the elongated gear is detachably mounted, said gear housing comprising a center plate, a pair of ends, means detachably securing the ends to the center plate, said gear housing having a box trackway formed therein, and a trunnion projecting from the pinion into the trackway whereby the pinion is held in constant mesh with the elongated gear.

3. A reciprocating gear mechanism comprising a pinion, drive means for said pinion, an externally cut elongated gear, said pinion meshing with said gear, a gear frame in which the elongated gear is detachably mounted, said gear housing comprising a center plate, a pair of ends, means detachably securing the ends to the center plate, said gear housing having a box trackway formed therein, a trunnion projecting from the pinion into the trackvvay whereby the pinion is held in constant mesh with the elongated gear, and a cross head secured to the gear housing, and. guides in which the cross head moves whereby the gear frame is held against twisting movement.

4. A reciprocating gear mechanism comprising a pinion, drive means for said pinion, an externally cut elongated gear, said pinion meshing with said gear, a gear frame in which the elongated gear is detachably mounted, said gear housing comprising a center plate, a pair of ends, means detachably securing the ends to the center plate, said gear housing having a box trackway formed therein, a trunnion projecting from the pinion into the trackway whereby the pinion is held in constant mesh with the elongated gear, said elongated gear comprising a plurality of rack sections, means detachably securing the rack sections to the gear frame, a pair of arcuate transfer gears, one at each end of the rack sections, and means removably securing the transfer gears in the end sections of the gear frame.

5. A reciprocating gear mechanism comprising a pinion, drive means for said pinion, an externally cut elongated gear, said pinion meshing with said gear, a gear frame in which the elongated gear is detachably mounted, said gear housing comprising a center plate, a pair of ends, means detachably securing the ends to the center plate, said gear housing having a box trackway formed therein, a trunnion projecting from the pinion into the trackway whereby the pinion is held in constant mesh with the elongated gear, Said elongated gear comprising a plurality of rack sections, means detachably securing the rack sections to the gear frame, a pair of arcuate transfer gears, one at each end of the rack sections, a hub on each transfer gear, said hub being arcuate in cross section, the gear frame ends having an arcuate bore therein to receive the hub whereby the transfer gears are held against movement in the frame ends.

6. A reciprocating gear mechanism comprising a pinion, drive means for said pinion, an externally cut elongated gear, said pinion meshing with said gear, a gear frame, means detachably securing the elongated gear to the gear frame, said gear frame having an elongated box trackway formed therein, a trunnion projecting from the pinion into the trackway whereby the pinion is held in constant mesh with the elongated gear, and a fly wheel on the drive means for said pinion.

'7. A reciprocating gear mechanism comprising a. pinion, drive means for said pinion, an externally cut elongated gear, said pinion meshing with said gear, a gear frame in which the elongated gear is detachably mounted, said gear housing comprising a center plate, a pair of ends, means detachably securing the ends to the center plate, said gear housing having a box trackway formed therein, a trunnion projecting from the pinion into the trackway whereby the pinion is held in constant mesh with the elongated gear, said elongated gear comprising a plurality of rack sections, means detachably securing the rack sections to the gear frame, a pair of arcuate transfer gears, one at each end of the rack sections, means removably securing the transfer gears in the end sections of the gear frame, a cross head secured to the gear frame, guides engaged by the cross head whereby twisting movement is prevented in the gear frame.

8. A reciprocating gear mechanism comprising a pinion, drive means for said pinion, an externally cut elongated gear, said pinion meshing with said gear, a gear frame, said gear frame having an elongated box trackway formed therein, a trunnion projecting from the pinion into the trackway whereby the pinion is held in constant mesh with the elongated gear, a fiy wheel on the drive means for said pinion, and a cross head secured to the gear frame, guides engaged by the cross head whereby twisting movement is prevented in the gear frame.

9. A reciprocating gear mechanism comprising a pinion, drive means for said pinion, an externally out elongated gear, said pinion meshing with said gear, a gear frame in which the elongated gear is detachably mounted, said gear housing comprising a center plate, a pair of ends,

ill

means detachably Securing the ends to the center plate, said gear housing having a box trackway formed therein, a trunnion projecting from the pinion into the trackway whereby the pinion is held in constant mesh with the elongated gear, said elongated gear comprising a plurality of rack sections, means detachably securing the rack sections to the gear frame, a pair of arcuate transfer gears, one at each end of the rack sections, means removably securing the transfer gears in the end sections of the gear frame, and a flywheel on the drive means for said pinion.

CONARD WARREN HUFFMAN. 

